fix(search): keep Load more; the count selector sets the batch size

Clarified per intent: the results-count selector controls how many results each fetch gathers,
and Load more pulls another batch of that size (restored). The infinite query already threads the
count into every page, so Load more honours the selected size. Added a tooltip on the selector.

frontend/src/components/Feed.tsx

@@ -352,6 +352,7 @@ export default function Feed({
               <select
                 value={ytCount}
                 onChange={(e) => setYtCount(Number(e.target.value))}
+                title={t("feed.yt.showHint")}
                 className="bg-card border border-border rounded-lg px-2 py-1 text-xs outline-none focus:border-accent"
               >
                 {[20, 40, 60, 100].map((n) => (
@@ -409,6 +410,21 @@ export default function Feed({
               isFetchingNextPage={false}
               fetchNextPage={() => {}}
             />
+            {ytQuery.hasNextPage && (
+              <div className="text-center pt-4">
+                <button
+                  onClick={() => ytQuery.fetchNextPage()}
+                  disabled={ytQuery.isFetchingNextPage}
+                  className="inline-flex items-center gap-2 px-4 py-2 rounded-xl border border-border bg-card text-sm font-medium hover:border-accent hover:text-accent disabled:opacity-50 transition"
+                >
+                  {ytQuery.isFetchingNextPage
+                    ? t("feed.loadingMore")
+                    : zeroQuota
+                      ? t("feed.yt.loadMoreFree")
+                      : t("feed.yt.loadMore")}
+                </button>
+              </div>
+            )}
           </>
         )}